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Novel Orientation-Sensitive Spin Probes for Graphene Oxide Membranes Studyстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Chumakova Natalia A., Kalai Tamas, Rebrikova Anastasiya T., Sár Cecília, Kokorin Alexander I.
- Журнал: Membranes
- Том: 12
- Номер: 12
- Год издания: 2022
- Издательство: MDPI Publishing
- Местоположение издательства: Basel, Switzerland, Switzerland
- Первая страница: 1241
- DOI: 10.3390/membranes12121241
- Аннотация: Spin probe EPR spectroscopy is currently the only method to quantitatively report onthe orientational ordering of graphene oxide membranes. This technique is based on the analysisof EPR spectra of a membrane containing stable radicals sorbed on oxidized graphene planes.The efficiency of the method depends on the spin probe structure; therefore, it is important tofind stable paramagnetic substances that are most sensitive to the alignment of graphene oxidemembranes. In the present work, three novel stable nitroxide radicals containing aromatic fragmentswith two nitrogen atoms were tested as spin probes to study graphene oxide membranes. The spin-Hamiltonian parameters of the radicals in graphite oxide powder and orientational order parametersof the probes inside graphene oxide membrane were determined. The sensitivity of one of theseradicals to membrane orientational ordering was found to be higher than for any of spin probesused previously. A likely reason for this higher sensitivity is the presence of heteroatoms which canfacilitate interaction between paramagnetic molecules and oxygen-containing groups on the innersurface of the membrane. The new high-sensitivity spin probe may significantly increase the potentialof EPR spectroscopy for studying the internal structure of graphene oxide membranes.
- Добавил в систему: Чумакова Наталья Анатольевна